diff --git a/Source/Core/VideoBackends/D3D/D3DState.cpp b/Source/Core/VideoBackends/D3D/D3DState.cpp
index b779683fb8..8a2862479b 100644
--- a/Source/Core/VideoBackends/D3D/D3DState.cpp
+++ b/Source/Core/VideoBackends/D3D/D3DState.cpp
@@ -212,6 +212,7 @@ StateCache::~StateCache()
 
 ID3D11SamplerState* StateCache::Get(SamplerState state)
 {
+  std::lock_guard<std::mutex> guard(m_lock);
   auto it = m_sampler.find(state.hex);
   if (it != m_sampler.end())
     return it->second;
@@ -266,6 +267,7 @@ ID3D11SamplerState* StateCache::Get(SamplerState state)
 
 ID3D11BlendState* StateCache::Get(BlendingState state)
 {
+  std::lock_guard<std::mutex> guard(m_lock);
   auto it = m_blend.find(state.hex);
   if (it != m_blend.end())
     return it->second;
@@ -348,6 +350,7 @@ ID3D11BlendState* StateCache::Get(BlendingState state)
 
 ID3D11RasterizerState* StateCache::Get(RasterizationState state)
 {
+  std::lock_guard<std::mutex> guard(m_lock);
   auto it = m_raster.find(state.hex);
   if (it != m_raster.end())
     return it->second;
@@ -372,6 +375,7 @@ ID3D11RasterizerState* StateCache::Get(RasterizationState state)
 
 ID3D11DepthStencilState* StateCache::Get(DepthState state)
 {
+  std::lock_guard<std::mutex> guard(m_lock);
   auto it = m_depth.find(state.hex);
   if (it != m_depth.end())
     return it->second;
diff --git a/Source/Core/VideoBackends/D3D/D3DState.h b/Source/Core/VideoBackends/D3D/D3DState.h
index 805ed8996b..db48e7f18b 100644
--- a/Source/Core/VideoBackends/D3D/D3DState.h
+++ b/Source/Core/VideoBackends/D3D/D3DState.h
@@ -6,6 +6,7 @@
 
 #include <array>
 #include <cstddef>
+#include <mutex>
 #include <unordered_map>
 
 #include "Common/BitField.h"
@@ -35,6 +36,7 @@ private:
   std::unordered_map<u32, ID3D11RasterizerState*> m_raster;
   std::unordered_map<u32, ID3D11BlendState*> m_blend;
   std::unordered_map<SamplerState::StorageType, ID3D11SamplerState*> m_sampler;
+  std::mutex m_lock;
 };
 
 namespace D3D